I mean, GM mode is specifically for on-the-fly "I sure didn't expect that" things the players do. I don't really see it being the end-all be-all for worlds. It's not really designed to be something like NWN2 stillh as to this day with persistent multi-map 40+ pplayer worlds that can ALSO have GMs for non-scripted stuff. It's pretty explicitly just having a GM to handhold the players through every interaction.
Whereas creating full campaigns with scripted NPC action and such is just... y'know... for scripted, massive worlds with their own set paths and yadda yadda blah blah.
The GM mode is a social thing for a small group of friends to have a pseudo-tabletop experience. Nothing else, not even from advertisements.
